UN 2241 — Cycloheptane
Placard: Flammable. ERG Guide 128. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2241 is Cycloheptane, a hazardous material assigned to ERG Guide 128. Verify exact hazards from shipping papers, markings and SDS.
Hazard overview: Hazards depend on the exact product, packaging and incident conditions. Verify the material using shipping papers, labels and SDS before close action. Fire may produce irritating or toxic smoke or gases.
Response guidance: For a UN 2241 incident, verify the product with shipping papers, container markings, SDS and ERG Guide 128. Establish incident command, isolate the area, stay upwind, control ignition or incompatibility hazards, prevent runoff, dust or vapor spread and base entry/fire-control actions on monitoring and local SOP.
Firefighter training notes: Training for UN 2241 should emphasize exposure routes, air monitoring, PPE selection, fire behavior, decontamination, runoff containment and ERG/SDS verification. Use ERG 128, SDS and local SOP.
Regulatory context: Cycloheptane is regulated as a hazardous material for transportation and emergency response purposes. Storage, workplace exposure, emergency planning, spill reporting, waste handling and environmental requirements vary by exact product, concentration, quantity and jurisdiction. Verify current requirements through shipping papers, SDS, container markings and applicable DOT, OSHA, EPA, NFPA, state or local authority guidance.
Storage & handling: Cycloheptane should be stored in compatible containers in a secure, cool, ventilated hazardous-material area according to SDS and local procedures.
UN 2241 Quick Details
Common Hazards of UN 2241
- Hazards depend on the exact product, packaging and incident conditions.
- Verify the material using shipping papers, labels and SDS before close action.
- Fire may produce irritating or toxic smoke or gases.
- Containers may fail or rupture when heated.
Chemical Identity & Physical Properties
Colorless liquid with a mild, petroleum-like odor. Highly volatile at room temperature.
| Also known as | SuberaneHeptamethyleneCycloheptyl hydride |
| CAS Number | 291-64-5 |
| Appearance | Colorless liquid with a mild, petroleum-like odor. Highly volatile at room temperature. |
| Flash Point | -6°C (21°F) |
| Boiling Point | 118°C (244°F) |
| Vapor Density | 3.4 (heavier than air) |
| Water Reactivity | No significant reaction; immiscible with water |
Fireground Response Guidance — UN 2241
Extinguishing Media
PPE Requirements
Use protective equipment selected from SDS, monitoring results and incident command.
Isolation & Evacuation
First Actions for a UN 2241 Incident
- CALL 911. Then call the emergency response telephone number on the shipping paper, if available.
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Avoid breathing vapors, dust, mist, smoke or fumes and avoid skin or eye contact.
- Do not touch damaged containers or spilled material unless properly trained and wearing appropriate protective equipment.
- Ventilate closed spaces before entering, but only if properly trained, equipped, monitored and authorized by incident command.
- Isolate the spill or release area and expand the perimeter for fire involvement, vapor spread, dust generation, water reaction or unknown product identity.
- Use ERG Guide 128, shipping papers, SDS, air monitoring and incident command for protective actions.
📋 Copy & Share Field Card
UN 2241 — CycloheptaneUse for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.